package com.hmdp.utils;

import org.springframework.data.redis.core.RedisAccessor;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    public static final Long BEGIN_TIMESTAMP = 1640995200L;
    public static final Long COUNT_BITS = 32L;

    private RedisTemplate redisTemplate;

    public RedisIdWorker(RedisTemplate redisTemplate){
        this.redisTemplate = redisTemplate;
    }

    public long nextId(String KeyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        //2.生成序列号
        //2.1获取当天时间
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2自增长
        Long count = redisTemplate.opsForValue().increment("icr" + KeyPrefix + ":" + date);

        //拼接返回
        return timestamp << COUNT_BITS | count;
    }

}
